1. INSULATION COORDINATION COURSE ELEC. ENG. DEPT. SHARIF U. of T. MEHDI VAKILIAN MAY 2009

2. INSULATION COORDINATION Specifying Insulation Strength In Standards - There exist a standard number series for both BIL & BSL that equipment standards are encouraged to use - For any specific equipment there is a relation between BIL & BSL - For example for a transformer, BSL is approximately 83% of BIL

3. INSULATION COORDINATION Specifying Insulation Strength In Standards

4. INSULATION COORDINATION Specifying Insulation Strength In Standards In IEC phase-phase tests are specified to verify phase-phase BSL The phase-phase BSL is specified as 1.5 to 1.7 phase-ground BSL In this case BSL are not the values listed

5. INSULATION COORDINATION ANSI Specification for BIL and BSL

6. INSULATION COORDINATION Specifying Insulation Strength In Standards In ANSI C92, no required voltage given for alternate system voltages That is user is free to select BIL & BSL from as desired However, practically there are a limited number of BILs and BSLs used at each system voltage

7. INSULATION COORDINATION Specifying Insulation Strength In Standards for USA these values presented in next tables for transformers, circuit breakers, and disconnecting switches

8. INSULATION COORDINATION ANSI Table:

9. INSULATION COORDINATION ANSI standard values for substations (ANSI)

10. INSULATION COORDINATION For Gas-insulated station (ANSI)

11. INSULATION COORDINATION ANSI standard levels for Cables

12. INSULATION COORDINATION Specified insulation withstands in In IEC standards